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http://www.plumbingsupply.com/pvccheck.html From: joeperkel@hotmail.com To: personal_submersibles@psubs.org Subject: Venting an Ambient Date: Thu, 4 Sep 2008 13:59:49 +0000 Someone asked about venting an ambient. I found some PVC check valves today which could quite possibly do the trick but I think you would have to ask two questions. What would a cracking pressure of 0.5 to 2 lbs translate to in hull overpressure, and how many would be required to dump expansion in an emergency ascent from max depth. Otherwise, these look pretty nifty! Joe |